LXR uboot/arch/arm/mach-tegra/tegra20/pmu.c

   1/*
   2 * Copyright (c) 2011 The Chromium OS Authors.
   3 * (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9#include <i2c.h>
  10#include <tps6586x.h>
  11#include <asm/io.h>
  12#include <asm/arch/tegra.h>
  13#include <asm/arch-tegra/ap.h>
  14#include <asm/arch-tegra/tegra_i2c.h>
  15#include <asm/arch-tegra/sys_proto.h>
  16
  17#define VDD_CORE_NOMINAL_T25    0x17    /* 1.3v */
  18#define VDD_CPU_NOMINAL_T25     0x10    /* 1.125v */
  19
  20#define VDD_CORE_NOMINAL_T20    0x16    /* 1.275v */
  21#define VDD_CPU_NOMINAL_T20     0x0f    /* 1.1v */
  22
  23#define VDD_RELATION            0x02    /*  50mv */
  24#define VDD_TRANSITION_STEP     0x06    /* 150mv */
  25#define VDD_TRANSITION_RATE     0x06    /* 3.52mv/us */
  26
  27#define PMI_I2C_ADDRESS 0x34    /* chip requires this address */
  28
  29int pmu_set_nominal(void)
  30{
  31        struct udevice *bus, *dev;
  32        int core, cpu;
  33        int ret;
  34
  35        /* by default, the table has been filled with T25 settings */
  36        switch (tegra_get_chip_sku()) {
  37        case TEGRA_SOC_T20:
  38                core = VDD_CORE_NOMINAL_T20;
  39                cpu = VDD_CPU_NOMINAL_T20;
  40                break;
  41        case TEGRA_SOC_T25:
  42                core = VDD_CORE_NOMINAL_T25;
  43                cpu = VDD_CPU_NOMINAL_T25;
  44                break;
  45        default:
  46                debug("%s: Unknown SKU id\n", __func__);
  47                return -1;
  48        }
  49
  50        ret = tegra_i2c_get_dvc_bus(&bus);
  51        if (ret) {
  52                debug("%s: Cannot find DVC I2C bus\n", __func__);
  53                return ret;
  54        }
  55        ret = i2c_get_chip(bus, PMI_I2C_ADDRESS, 1, &dev);
  56        if (ret) {
  57                debug("%s: Cannot find DVC I2C chip\n", __func__);
  58                return ret;
  59        }
  60
  61        tps6586x_init(dev);
  62        tps6586x_set_pwm_mode(TPS6586X_PWM_SM1);
  63        return tps6586x_adjust_sm0_sm1(core, cpu, VDD_TRANSITION_STEP,
  64                                VDD_TRANSITION_RATE, VDD_RELATION);
  65}
  66